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This commit is contained in:
Evghenii
2014-02-02 19:01:10 +01:00
parent 92e69c8197
commit 6d034596d3
2 changed files with 28 additions and 4 deletions
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18
examples_ptx/nbody/nbody.ispc
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@@ -26,6 +26,16 @@ void closeNbody()
delete gpotList;
}
static inline
real rsqrt_real(real r2)
{
#if 1
return r2> (real)0.0 ? (real)1.0d0/sqrt(r2) : 0;
#else
return r2> (real)0.0 ? rsqrt((float)r2) : 0;
#endif
}
uniform int nn = programCount;
@@ -64,7 +74,7 @@ void computeForces(
const real dy = jposy - iposy;
const real dz = jposz - iposz;
const real r2 = dx*dx + dy*dy + dz*dz;
const real rinv = r2> 0.0d ? 1.0/sqrt(r2) : 0;
const real rinv = rsqrt_real(r2);
const real mrinv = -jmass * rinv;
const real mrinv3 = mrinv * rinv*rinv;
@@ -104,7 +114,11 @@ void computeForces(
const real dy = jposy - iposy;
const real dz = jposz - iposz;
const real r2 = dx*dx + dy*dy + dz*dz;
const real rinv = r2 > 0.0d ? 1.0/sqrt(r2) : 0;
#if 0 /* faster */
const real rinv = r2> (real)0.0 ? (real)1.0d0/sqrt(r2) : 0;
#else
const real rinv = rsqrt_real(r2);
#endif
const real mrinv = -jmass * rinv;
const real mrinv3 = mrinv * rinv*rinv;